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https://issues.apache.org/jira/browse/HBASE-26197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang updated HBASE-26197:
------------------------------
Hadoop Flags: Reviewed
Resolution: Fixed
Status: Resolved (was: Patch Available)
Pushed to branch-2.3+.
Thanks [~comnetwork] for contributing.
> Fix some obvious bugs in MultiByteBuff.put
> ------------------------------------------
>
> Key: HBASE-26197
> URL: https://issues.apache.org/jira/browse/HBASE-26197
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha-1, 2.4.5
> Reporter: chenglei
> Assignee: chenglei
> Priority: Major
> Fix For: 2.5.0, 3.0.0-alpha-2, 2.3.7, 2.4.7
>
>
> MultiByteBuff.put(int destOffset, ByteBuff src, int srcOffset, int length)
> has some obvious bugs:
> * It seems mix up {{items}} in {{src}} {{MutiByteBuff}} and {{items}} in the
> {{dest}} {{MultiByteBuff}} , just as line 749 and line 754 illustrated. The
> logic is only right when src {{ByteBuff}} is also a {{MultiByteBuff}} and
> byte size of every {{ByteBuffer}} in {{src.items}} has exactly the same size
> as every {{ByteBuffer}} in the {{dest.items}},but looking the usage of this
> method in the hbase project, obviously the assumption is not right.
> {code:java}
> 746 public MultiByteBuff put(int offset, ByteBuff src, int srcOffset, int
> length) {
> 747 checkRefCount();
> 748 int destItemIndex = getItemIndex(offset);
> 749 int srcItemIndex = getItemIndex(srcOffset);
> 750 ByteBuffer destItem = this.items[destItemIndex];
> 751 offset = offset - this.itemBeginPos[destItemIndex];
> 752
> 753 ByteBuffer srcItem = getItemByteBuffer(src, srcItemIndex);
> 754 srcOffset = srcOffset - this.itemBeginPos[srcItemIndex];
> ...
> {code}
>
> * If src is {{SingleByteBuff}} and its remaining space is fewer than
> length，when remaining space is exhausted, this {{MultiByteBuff.put}} method
> would not throw any exception and continue to put src {{ByteBuff}} once again
> from position 0 because following {{MultiByteBuff.getItemByteBuffer}} ignores
> index paramter for {{SingleByteBuff}} . Obviously, this behavior is much
> strange and unexpected.
> {code:java}
> private static ByteBuffer getItemByteBuffer(ByteBuff buf, int index) {
> return (buf instanceof SingleByteBuff) ? buf.nioByteBuffers()[0]
> : ((MultiByteBuff) buf).items[index];
> }
> {code}
> Why seems tests is OK with too much bugs? Because in normal cases, we just
> use {{SingleByteBuff}} not {{MultiByteBuff}}.
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